WO1991003657A1

WO1991003657A1 - Synchronising ring

Info

Publication number: WO1991003657A1
Application number: PCT/EP1990/001476
Authority: WO
Inventors: Otto Benz; Johannes Dietrich
Original assignee: Zahnradfabrik Friedrichshafen Ag
Priority date: 1989-09-06
Filing date: 1990-09-03
Publication date: 1991-03-21

Abstract

In a synchronising ring (1) for a synchronisation device in a gearbox of a vehicle transmission system with two conical surfaces (2, 3) parallel to each other and the drive shaft, the two surfaces (2, 3) are interrupted in the peripheral direction by the shaping (4) of the entire synchronising ring (1) and have a friction contact coating. This conically shaped and coated synchronising ring (1) is calibrated in dimension and concentricity and the running surfaces (2, 3) arranged on either side are compressed and smoothed and have a uniform contour. The dimension and concentricity accuracy together with the compressed and smoothed running surfaces is obtained via a permanent deformation during the calibration process. The dimension, face and concentricity calibration and the compression and smoothing of the running surfaces are obtained in a single working cycle with a simply constructed tool fitted in a pillar jig.

Description

Synchronization ring

The invention relates to a synchronizing ring, a method for its calibration and a tool for carrying out the method, wherein the synchronizing ring is arranged in a synchronizing device of a clutch of a vehicle transmission, has two conical surfaces parallel to the transmission axis, which by profiling the entire synchronizing ring in

Circumferential direction are interrupted, and that both surfaces have a friction surface coating. Such a synchronizing ring of a double-cone synchronizing device is known both as a sheet metal part and as a sintered part.

A synchronizing ring as a sheet metal part and, for example, coated on both sides is known from PCT-WO 87/06 314. Synchronizer rings, which have friction surfaces coated on the inner and outer cone and interact with other simple synchronizer rings, have also proven themselves to a limited extent in this version in double-cone clutches, although their dimensional accuracy and the quality of the molybdenum custom coating on the outer and inner friction surfaces, for example, still work can not satisfy. This applies to rings which were produced and coated in accordance with PCT-WO 87/06 314, but also for synchronizer rings which were produced and subsequently coated in the sintering process.

It is therefore an object of the invention, one

Synchronizer ring according to the preamble of claim 1 to improve in terms of dimensional accuracy, concentricity and surface quality of the friction surfaces.

This object is achieved with the characterizing features of claim 1 for the synchronizing ring, of claim 2 for the method and of claim 8 for the tool Implementation of the procedure. According to the state of the art, considerable dimensional and concentricity tolerances have been accepted in the case of coated synchronizing rings, because there are no noteworthy results via simple calibration, concentric smoothing or grinding processes

Quality improvements of the synchronizing rings could be achieved. This made it necessary to provide in the axial direction between the neutral position and the synchronizing position of the clutch bigger way ^', which was opposed to a targeted short-path synchronization. With the effective calibration of the diameter and the concentricity of the synchronizing ring with simultaneous compression and smoothing of the running surfaces arranged on both sides, it is possible to significantly reduce the tolerances and thus to make them shorter

To achieve synchronization devices. While generally known calibrations have remained in the elastic range of the forming, the dimensional and concentricity calibration and the smoothing of the running surfaces of the coating become conscious with a favorable contact pattern

Forming the synchronizer ring connected outside the elastic range. It is particularly advantageous if both the dimensional and concentricity calibration as well as the smoothing of the coated inner and outer treads are carried out in one operation, because this means that for the permanent

Forming necessary dimensioning of the blank must be done only once, and the high dimensional accuracy of the synchronizing rings is achieved inexpensively. If the synchronizing ring is stretched for permanent forming, the existing conical shape of the synchronizing ring results in a favorable holding of the blank in the tool, wherein the blank can be designed both as a sheet metal part and as a sintered part. With the smoothing and calibration of the rough injection-molded molybdenum coating, the otherwise heavy run-in wear is prevented at the same time, so that the resulting larger one Axial path proves to be unnecessary. As a result of the shaping process of smoothing and calibrating the dimensions, the protruding tips, which are produced, for example, with a molybdenum coating, are precompressed to a surface with a good contact pattern. By reshaping, in particular by stretching the profiled ring, the tensile and compressive stresses are neutralized and the required concentricity is achieved. The design of the tool enables the outer and inner running surfaces of the synchronizing ring to be compressed and smoothed at the same time, so that a good contact pattern results. At the same time, calibration is carried out to the intended diameter dimensions, to the concentricity and to the axial runout. The tool is. simply constructed, and its manufacture is greatly simplified by installing it in a standardized column frame. In addition, this tool can be installed in single-acting presses due to the residual forming during calibration. Neither double-acting presses nor embossing presses, as is usual with calibration tools, are necessary. In a particularly advantageous manner, the

Repeatability achieved over block dimensions, which are not in connection with the workpiece, and the special wear-bearing smoothing stamp and smoothing ring is made of hard metal, both of which are clamped in special sockets, via simple ejector devices, preferably spring ejectors, can be removed from the calibrated and smoothed synchronization ring can be improved with simple means.

The invention is not limited to the combination of features of the claims. For the specialist, there are further useful combinations of claims and individual claim characteristics from the task. Further details of the invention will be explained with reference to drawings and exemplary embodiments. Show it:

Fig. 1 _ ht a synchronizer in Draufsic ^";

2 shows a synchronizing ring in section;

Fig. 3 shows a detail from Fig. 1 with the

Profiling; _ ^' .

4, 4 A the arrangement of a board in one

Punched strips in a synchronizing ring as a sheet metal part;

Fig. 5, 5 A, the board of Figure 4, however, embossed.

Fig. 6, 6 A, the embossed and formed circuit board;

Fig. 7 is a dimension and Umformkalibrier- and smoothing tool.

1-3 has two mutually parallel conical surfaces 2, 3, which are interrupted by profiling - hollow embossing - of the entire synchronizing ring 1 so that the recesses 5, 6 on one side have the conical surfaces 2, 3 on the other hand. The pitch 41 for the profiling - profile 4 -, which runs in the circumferential direction, is approximately 1/50 of the outer diameter 11 of the synchronizing ring 1 and is approximately uniform. With two

Friction pairs in the synchronizing device both conical surfaces 2, 3 are provided with a friction layer 7. If the synchronizing ring is provided as a sheet metal part, it is primarily manufactured in the manner shown in FIGS. 4, 4 A - 6, 6 A. 4 and 4 A, the board 13 is in connection with the punched strip 130 recognizable from which it can be punched out, for example, with the aid of a complete cut. To achieve flawless cut edges, this can also be done using a. Fine cutting processes are carried out. The blank 131 which is produced as waste during the production of this circuit board 13 can be used for further circuit boards which are dimensioned differently. 5 and 5 A, the board is shown embossed, so that there are recesses and elevations evenly distributed over the circumference. The plate 14 thus embossed is raised in a drawing tool, so that a conically drawn plate 15 results with the total width 16 according to FIG. 2, that is to say with the drivers .8. In this configuration, for example, the molybdenum dimension coating is carried out and is thus coated blank for dimension, concentricity and face calibration as well as for smoothing and compressing the outer and inner conical surfaces. Fig. 7 shows an advantageous embodiment of a tool for producing the synchronizing ring according to claim 1 and implementation of the method according to claim 2. The components of the tool 10 are arranged in a Säulenc ^ stell 100. The

The lower part 101 of the tool with the flange 114, the centering disk 111, the retaining ring 115, the conical smoothing punch 103, the spacer disk 109 and the conical retaining ring 107 are firmly connected to the lower part 100 / rev of the column frame 100. The spacer 109 also has a recess 112 with which it engages in a bore 113 in the conical smoothing die 103. The upper part 102 and the lower part 101 are fixed to the upper part 100 / O of the column frame 100 with the plate 116, the centering ring 117, the tuning ring 118, the conical ring stamp 105, the conical smoothing ring 104 and the reinforcing ring 110 via centering pins 119, and the central guidance takes place via the columns 100 / S of the column frame. The tool works as follows: When opened tool, the blank of the synchronizing 1R, of 1-2% is smaller in diameter is threaded than the finished synchronizing ring 1, in the top ^'of the conical portion 120 Glättstempels 103rd When the tool is closed, the conical smoothing ring 104 initially covers the outer conical surface, so that the synchronizing ring is clamped between the conical smoothing punch 103 and the conical smoothing ring 104. The synchronizing ring is pressed in the direction of the holding ring 107 by means of the conical ring punch 105, which presses with its end face ^ Ö on the end face 17 (FIG. 2) of the synchronizing ring when the tool is closed further. During this process, the outer and inner conical surfaces 2, 3 are sealed and smoothed and the entire ring is stretched. A constant deformation is achieved via the block dimension between the centering ring 117 and the spacer 109, via the compression and smoothing of the outer and inner conical surface - friction surface of the synchronizer ring - the gap between the conical smoothing die 103 and the conical smoothing ring 104 results in a uniform Thickness - element thickness - of the ring, a possible excessive displacement of the synchronizing ring in the direction of the lower part of the tool is prevented by covering the outer conical surface 2 with the conical smoothing ring 104, by means of suitable lubricants it can be achieved that the

Synchronizer ring is pulled over the conical smoothing ring 104 when the tool is opened with the conical smoothing punch 103, and can be easily removed from the tool after the tool has been completely opened. For a forced demolding, the conical retaining ring 107 and the conical ring punch 105 can also be set up in such a way that the fully calibrated and smoothed synchronizer ring via a forced or spring ejection device in the lower part of the conical smoothing punch 103 and the conical smoothing ring 104 in Upper part 102 is removed from the mold, via the tuning ring 118 it is possible, in addition to the block dimension on the spacer 109, to also design the pushing onto the smoothing die 103 in a defined manner.

reference numeral

1 synchronization ring

1R blank of the synchronizing ring 11 Large outside diameter

12 Small outside diameter

13 circuit board

130 punched strips

131 Ronde 14 Profiled circuit board

15 tapered profiled board

16 total width

2 Outer conical surface / friction surface of the synchronization - 3 Inner conical surface / friction surface of the synchronization

4 Profile / Profiling 41 division

5 wells 6 wells

7 friction layer

8 drivers 10 tools

100 column frame 100 / U lower part of the column frame

100 / O upper part of the column frame

100 / S columns of the column frame

101 lower part of the tool

102 Upper part of the tool 103 Conical smoothing stamp

104 conical smoothing ring

105 Conical ring stamp

106 face of the ring stamp

107 Conical retaining ring 108 Upper area of the retaining ring 109 spacer

110 reinforcement ring

111 centering disc

112 Turning on the spacer 113 Bore in the conical smoothing punch

114 flange

115 retaining ring

116 plate

117 centering ring 118 tuning ring

119 centering pins

120 Upper area of the conical smoothing punch

Claims

Expectations

1. Synchronizing ring (1) for a synchronizing device in a clutch of a vehicle transmission with two conical surfaces (2, 3) which are parallel to the transmission axis and which are formed by profiling (4) the entire synchronizing ring (1). Circumferential direction are interrupted, and both surfaces> (2, ^" 3) have a friction surface coating, characterized in that the conically shaped and coated synchronizing ring (1) is dimensionally, plane and concentric calibrated, and the running surfaces (2, 3) arranged on both sides are compressed and smoothed so that there is a uniform contact pattern on the treads (2, 3) on the inner and outer cone.

2. A method for producing a Synchronisierringeε (1) according to claim 1, characterized in that for calibrating and compacting and smoothing the treads (2, 3) of the blank of the synchronizing ring (1R) is designed so that the smoothing and calibrating process simultaneously permanent reshaping takes place.

3. The method according to claim 2, characterized in that the compacting and smoothing of the coated running surfaces (2, 3) and the calibration to the gauge in the diameters (11, 12) and the plan and concentricity calibration are carried out in one operation.

4. The method according to claim 3, characterized in that the synchronizer ring (1) is stretched in the circumferential direction during compression, smoothing and calibration.

5. The method according to claim 4, characterized g e k e n n z e i c h n e t that between the diameter dimensions of the blank and the smoothed and calibrated finished dimensions (li, 12) of the synchronizing ring (1) there are diameter differences of 1-2%.

6. The method according to claim 5, characterized in that the blank of the - ^{• '} synchronizing ring (IR) from a board (13) in _. is flat state of profiled (14) sheet metal blank drawn and precalibrated on the conical shape (15).

7. The method according to claim 5, characterized g e k e n n z e i c h n e t that the blank for the synchronizing ring is a sintered part.

8. Tool (10) for performing the method according to claim 2, characterized in that - in the lower part (101? Of the tool (10) a conical smoothing punch (103) is arranged, which at the same time receives the blank (IR); in the upper part of the Tool (102) is arranged a conical smoothing ring (104) which covers the full width of the blank (IR); within the smoothing ring (104) in the upper part (102) of the tool (10) a conical ring stamp (105) is arranged, which presses with its end face (106) facing the lower part (101) of the tool (10) onto the upward facing end face (17) of the synchronizer ring (1); against the ring punch (105) arranged in the upper part, in the lower part (101) the tool (10) has a conical retaining ring (107) which, when the tool (10) is closed, is located in the upper region between

Smoothing stamp (103) and smoothing ring (104) is arranged; - The tool (10) when smoothing the inside and

Outer friction surfaces (2, 3) and when calibrating the diameters (11, 12) and the face and round run are set to ^" block" in order to achieve repeatability.

9. Tool according to claim 8, characterized g e k e n n z e i c h n e t that the block dimension in connection with a defined diameter dimension of the synchronizer ring (1) is achieved in a simple manner via tuning rings (118) or spacers (109).

10. Tool according to claim 9, characterized in that the smoothing stamp (103) and the smoothing ring (104) are made of hard metal.

11. Tool according to claim 10, characterized in that the hard metal ring (104) is arranged in the upper part (102) of the tool in a reinforcing ring (110); the hard metal stamp (103) in the lower part (101) of the tool in a centering disk (111) and a spacer disk (109) attached to the centering disk via a rotation (112) in a bore (113) of the

Tungsten carbide stamp (103) is centered and supported.

12. Tool according to claim 11, characterized g e k e n n z e i c h n e t that the ring stamp (105) in the upper part (102) of the tool (10) and the conical

Retaining ring (107) in the lower part (101) are designed as ejectors.

13. Tool according to claim 12, characterized in that the ejectors are spring ejectors.